Overall Dimensions â High School. High School Overall football field dimensions are as follows: Length: 360 feet or 120 yards. Width: 160 feet or 53 1/3 yards. End Zone: High School end zones are 10 yards deep. End Line: A six foot end line border marks the back of the end zone. Field Numbers: Sideline field numbers are 6 foot high by 4 foot wide designating each 10 yard line marker.
1 On average, dogs have two cycles a year. 2  The estrus cycle lasts on average 12-21 days, but maybe be as short as a few days to four weeks. 3  The estrus period length varies widely between breeds and individual dogs. 4  The length of a cycle varies widely, even for dogs of the same breed.
The first heat cycle occurs when a female dog is between 6 and 24 months old, typically occurring earlier for smaller breed animals. An unspayed female has two heat cycles per year, approximately every six months. The three stages of a female dog's heat cycle include proestrus, estrus and diestrus.